Attach vs Fasten vs Secure

When to use each in English, with meaning, register, and examples.

Attach

Top 1,000 (very common)B1verb

Fasten

Top 3,000 (common)B1verb

Secure

Top 1,000 (very common)B2verb
 AttachFastenSecure
Pronunciation🇬🇧 /["/əˈtætʃ/","/əˈtætʃɪz/","/əˈtætʃt/","/əˈtætʃɪŋ/"]/🇺🇸 /["/əˈtætʃ/","/əˈtætʃɪz/","/əˈtætʃt/","/əˈtætʃɪŋ/"]/🇬🇧 /["/ˈfɑːsn/","/ˈfɑːsnz/","/ˈfɑːsnd/","/ˈfɑːsnɪŋ/"]/🇺🇸 /["/ˈfæsn/","/ˈfæsnz/","/ˈfæsnd/","/ˈfæsnɪŋ/"]/🇬🇧 /["/sɪˈkjʊə(r)/","/sɪˈkjʊəz/","/sɪˈkjʊəd/","/sɪˈkjʊərɪŋ/"]/🇺🇸 /["/sɪˈkjʊr/","/sɪˈkjʊrz/","/sɪˈkjʊrd/","/sɪˈkjʊrɪŋ/"]/
Meaningto connect or fasten something to another thingTo make something secure or tight.To make safe or protect something.
ExamplePlease attach the document to your email before sending it.Please fasten your seatbelt before the flight.We need to secure the doors before we leave for the night.
RegisterNeutralNeutralNeutral
How commonTop 1,000 (very common)Top 3,000 (common)Top 1,000 (very common)
CEFR levelB1B1B2
Part of speechverbverbverb
Collocationsfirmly, securely, loosely, tofirmly, properly, securely, to, firmly, properly, securely, to, firmly, properly, securely, to, firmly, properly, securely, toeasily, safely, eventually, be able to, manage to, fail to, an attempt to secure something, an effort to secure something, be aimed at securing something, firmly, properly, tightly, to, with
Antonymsdetach, removeloosen, unfastendanger, unsecure, risk
Common mistakesConfused with 'detach' – forgetting to use the right prefix., Using 'attaching' incorrectly in passive constructions., Not following with an object, e.g., 'attach to' instead of 'attach the document to'.Confusing 'fasten' with 'loosen'., Using 'fasten' without an object, e.g., saying 'I need to fasten.' instead of 'I need to fasten my seatbelt.', Mixing up 'fasten' with other similar verbs like 'attach' or 'secure'.Confused with 'ensure' - 'ensure' means to make sure something happens., Using 'secured' as an adjective when it should be a verb., Misplacing the emphasis on the second syllable.
Usage notesUse 'attach' for both physical and abstract connections, like emails or documents. Less common in very formal writing. Avoid with informal language unless using slang.Use 'fasten' when you want to describe securing something, like a seatbelt or a button. It's appropriate in most contexts.Used to indicate making something safe, but can also mean to obtain or achieve something. More common in formal contexts when referring to safety and in neutral situations for obtaining.

Frequently asked questions: Attach vs Fasten vs Secure

What's the difference between Attach, Fasten, and Secure?

Attach: to connect or fasten something to another thing Fasten: To make something secure or tight. Secure: To make safe or protect something.

Which is more advanced: Attach, Fasten, and Secure?

Secure is the highest level, at B2, on the CEFR scale.

Are Attach, Fasten, and Secure the same CEFR level?

Attach: B1, Fasten: B1, Secure: B2 on the CEFR scale.

What part of speech are Attach, Fasten, and Secure?

Attach: verb, Fasten: verb, Secure: verb.

Can you show an example of each?

Attach: Please attach the document to your email before sending it. Fasten: Please fasten your seatbelt before the flight. Secure: We need to secure the doors before we leave for the night.

Can I use Attach, Fasten, and Secure interchangeably?

Not always. Attach, Fasten, and Secure are related and overlap in some contexts, but they differ in register, how common they are, and usage, so swapping one for another can change the meaning or tone. Check the differences above before substituting.

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